The Marriage and Family Experience: Research additionally indicates that non-married couples who are cohabiting engage in sexual intercourse more often than married couples, and are more likely to participate in sexual activity outside of their sexual relationships; this may be due to the " honeymoon " effect the newness or novelty of sexual intercourse with the partnersince sexual intercourse is usually practiced less the longer a couple is married, with couples engaging in sexual intercourse or other sexual activity once or twice a week, or approximately six to seven times a month. NYU Press. Kalbfleisch; Michael J. The females can store sperm indefinitely. Dutton Publishing.
Discovery Publishing House.
Psychopathology and theory". Hyatt Dulles Airport, Herndon, Virginia.